The First Lady exercised her right to look stylish after the polls closed Tuesday night, wearing a pintucked magenta silk chine Michael Kors dress (she’s a fan of the designer), House of Lavande Vintage brooch and black shrug for her husband’s acceptance speech in Chicago. And in true Michelle fashion, she chose a dress she’d worn — twice — before.

“She said that she was so busy with the campaign and their kids that she had no time to think about an outfit and decided at the last minute,” an Obama source tells PEOPLE.

“Mrs. Obama looked chic and elegant as always on election night,” Kors says in a statement. “My dress, with its strong color, clean lines and feminine silhouette, has all the elements that have become a part of the trademark style of our First Lady.”